90242 has 4 divisors (see below), whose sum is σ = 135366. Its totient is φ = 45120.

The previous prime is 90239. The next prime is 90247. The reversal of 90242 is 24209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24209 = 43 ⋅563.

It can be written as a sum of positive squares in only one way, i.e., 89401 + 841 = 299^2 + 29^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90242.

It is not an unprimeable number, because it can be changed into a prime (90247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22559 + ... + 22562.

2⁹⁰²⁴² is an apocalyptic number.

90242 is a deficient number, since it is larger than the sum of its proper divisors (45124).

90242 is a wasteful number, since it uses less digits than its factorization.

90242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45123.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 90242 is about 300.4030625676. The cubic root of 90242 is about 44.8541781828.

The spelling of 90242 in words is "ninety thousand, two hundred forty-two".